let a = 0.1 + 0.2
console.log(a)
let b = parseFloat(a.toFixed(5))
console.log(b)

// 计算机存储数值 64位== 1符号位+11指数位+52有效位
// 0.1(2) =====> https://www.cnblogs.com/zhang-bobo/p/13782458.html
// 0.1和0.2 的二进制表示是无限循环的 52位不够用只能取大致值
// 0.0001100110011...

let c = 1.1 * 100
let d = 1.1 * 10 * 10
console.log(c);
console.log(d);

let e = 3.3 / 1.1
console.log(e);
// https://www.cnblogs.com/tugenhua0707/p/3511453.html